/Engine/Source/Runtime/WebBrowser/Public/IWebBrowserWindow.h
A delegate that is invoked before the browser loads a resource. Its primary purpose is to inject headers into the request.
typedef [TMap](API\Runtime\Core\Containers\TMap)< [FString](API\Runtime\Core\Containers\FString), [FString](API\Runtime\Core\Containers\FString) > FRequestHeaders